local st = require("util.stanza");

local schema_t = {}

local function toboolean(s)

	if s == "true" or s == "1" then

		return true

	elseif s == "false" or s == "0" then

		return false

	elseif s then

		return true

	end

end

local function totype(t, s)

	if t == "string" then

		return s

	elseif t == "boolean" then

		return toboolean(s)

	elseif t == "number" or t == "integer" then

		return tonumber(s)

	end

end

local value_goes = {}

local function unpack_propschema(propschema, propname, current_ns)

	local proptype = "string"

	local value_where = "in_text_tag"

	local name = propname

	local namespace = current_ns

	local prefix

	local single_attribute

	local enums

	if type(propschema) == "table" then

		proptype = propschema.type

	elseif type(propschema) == "string" then

		proptype = propschema

	end

	if proptype == "object" or proptype == "array" then

		value_where = "in_children"

	end

	if type(propschema) == "table" then

		local xml = propschema.xml

		if xml then

			if xml.name then

				name = xml.name

			end

			if xml.namespace then

				namespace = xml.namespace

			end

			if xml.prefix then

				prefix = xml.prefix

			end

			if proptype == "array" and xml.wrapped then

				value_where = "in_wrapper"

			elseif xml.attribute then

				value_where = "in_attribute"

			elseif xml.text then

				value_where = "in_text"

			elseif xml.x_name_is_value then

				value_where = "in_tag_name"

			elseif xml.x_single_attribute then

				single_attribute = xml.x_single_attribute

				value_where = "in_single_attribute"

			end

		end

		if propschema["const"] then

			enums = {propschema["const"]}

		elseif propschema["enum"] then

			enums = propschema["enum"]

		end

	end

	return proptype, value_where, name, namespace, prefix, single_attribute, enums

end

local parse_object

local parse_array

function parse_object(schema, s)

	local out = {}

	if type(schema) == "table" and schema.properties then

		for prop, propschema in pairs(schema.properties) do

			local proptype, value_where, name, namespace, prefix, single_attribute, enums = unpack_propschema(propschema, prop, s.attr.xmlns)

				if proptype == "object" then

					local c = s:get_child(name, namespace)

					if c then

						out[prop] = parse_object(propschema, c);

					end

				elseif proptype == "array" then

					out[prop] = parse_array(propschema, s);

				else

					error("unreachable")

				end

			elseif value_where == "in_wrapper" and type(propschema) == "table" and proptype == "array" then

				local wrapper = s:get_child(name, namespace);

				if wrapper then

					out[prop] = parse_array(propschema, wrapper);

				else

					error("unreachable")

				end

			else

				out[prop] = totype(proptype, value)

			end

		end

	end

	return out

end

function parse_array(schema, s)

	local proptype, value_where, child_name, namespace = unpack_propschema(schema.items, nil, s.attr.xmlns)

	local out = {}

	for c in s:childtags(child_name, namespace) do

		local value;

		if value_where == "in_text_tag" then

			value = c:get_text();

		else

			error("NYI")

		end

		value = totype(proptype, value)

		if value ~= nil then

			table.insert(out, value);

		end

	end

	return out

end

local function parse(schema, s)

	if schema.type == "object" then

		return parse_object(schema, s)

	elseif schema.type == "array" then

		return parse_array(schema, s)

	else

		error("top-level scalars unsupported")

	end

end

local function unparse(schema, t, current_name, current_ns, ctx)

	if schema.xml then

		if schema.xml.name then

			current_name = schema.xml.name

		end

		if schema.xml.namespace then

			current_ns = schema.xml.namespace

		end

	end

	local out = ctx or st.stanza(current_name, {xmlns = current_ns})

	if schema.type == "object" then

		for prop, propschema in pairs(schema.properties) do

			local v = t[prop]

			if v ~= nil then

				local proptype, value_where, name, namespace, prefix, single_attribute = unpack_propschema(propschema, prop, current_ns)

				if value_where == "in_attribute" then

					local attr = name

					if prefix then

						attr = prefix .. ":" .. name

					elseif namespace ~= current_ns then

						attr = namespace .. "\1" .. name

					end

					if proptype == "string" and type(v) == "string" then

						out.attr[attr] = v

					elseif proptype == "number" and type(v) == "number" then

						out.attr[attr] = string.format("%g", v)

					elseif proptype == "integer" and type(v) == "number" then

						out.attr[attr] = string.format("%d", v)

					elseif proptype == "boolean" then

						out.attr[attr] = v and "1" or "0"

					end

				elseif value_where == "in_text" then

					if type(v) == "string" then

						out:text(v)

					end

				elseif value_where == "in_single_attribute" then

					local propattr = {}

					if namespace ~= current_ns then

						propattr.xmlns = namespace

					end

					if proptype == "string" and type(v) == "string" then

						propattr[single_attribute] = v

					elseif proptype == "number" and type(v) == "number" then

						propattr[single_attribute] = string.format("%g", v)

					elseif proptype == "integer" and type(v) == "number" then

						propattr[single_attribute] = string.format("%d", v)

					elseif proptype == "boolean" and type(v) == "boolean" then

						propattr[single_attribute] = v and "1" or "0"

					end

					out:tag(name, propattr):up();

				else

					local propattr

					if namespace ~= current_ns then

						propattr = {xmlns = namespace}

					end

					if value_where == "in_tag_name" then

						if proptype == "string" and type(v) == "string" then

							out:tag(v, propattr):up();

						elseif proptype == "boolean" and v == true then

							out:tag(name, propattr):up();

						end

					elseif proptype == "string" and type(v) == "string" then

						out:text_tag(name, v, propattr)

					elseif proptype == "number" and type(v) == "number" then

						out:text_tag(name, string.format("%g", v), propattr)

					elseif proptype == "integer" and type(v) == "number" then

						out:text_tag(name, string.format("%d", v), propattr)

					elseif proptype == "boolean" and type(v) == "boolean" then

						out:text_tag(name, v and "1" or "0", propattr)

					elseif proptype == "object" and type(propschema) == "table" and type(v) == "table" then

						local c = unparse(propschema, v, name, namespace);

						if c then

							out:add_direct_child(c);

						end

					elseif proptype == "array" and type(propschema) == "table" and type(v) == "table" then

						if value_where == "in_wrapper" then

							local c = unparse(propschema, v, name, namespace);

							if c then

								out:add_direct_child(c);

							end

						else

							unparse(propschema, v, name, namespace, out);

						end

					else

						error("NYI")

					end

				end

			end

		end

		return out

	elseif schema.type == "array" then

		local proptype, value_where, name, namespace = unpack_propschema(schema.items, current_name, current_ns)

		if proptype == "string" then

			for _, item in ipairs(t) do

				if value_where == "in_text_tag" then

					out:text_tag(name, item, {xmlns = namespace});

				else

					error("NYI")

				end

			end

		else

			error("NYI")

		end

		return out

	end

end

return {parse = parse; unparse = unparse}